c++ for-loop header flexibilities

• Part 1 can declare multiple variables of the SAME type:(
• Part 3 can modify multiple variables of DIFFERENT types, separated by comma:)
  • See my code https://github.com/tiger40490/repo1/blob/cpp1/cpp/array/oracleDayTrader_Nsdq.cpp

size_t countLinkedNodes(){
  size_t ret=0;
  for (Node * i=head; ; 
       ++ret, i=i->next){ //<-- different data types
    if (i == NULL) return ret; //<-- more control+clarify to move part 2 out of header!
  }
}